Materials Literature
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A procedure is developed for obtaining the radial distribution of electrons in free atoms from electron diffraction data which makes use of the similarity of the expressions characterizing the scattering of fast electrons and x-rays by atoms. Requirements are formulated pertaining to accuracy and angular range of data…
1. A study of calcium turnover and calcium deposition by the oyster mantle in the absence of other soft tissues has been carried out using mantle-shell preparations of Crassostrea virginica.2. The mantle of the mantle-shell preparation is able to deposit calcium from the sea water in shell. At least part of the calciu…
Abstract A method has been developed for marking the pores in egg shells by immersing them in concentrated nitric acid for very short periods of time. This makes the pores easily visible under the microscope, and counting can then be done by a statistical method. Not only is the total number of pores determined, but a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Reaction of Carbon Monoxide with Free RadicalsGerald B. Porter and Sidney W. BensonCite this: J. Am. Chem. Soc. 1953, 75, 11, 2773–2774Publication Date (Print):June 1, 1953Publication History Published online1 May 2002Published inissue 1 June 1953https://pubs.acs.org/doi…
The anisotropy energy of CuCl2-2H2O having an orthorhombic symmetry can be expressed by K1β2 + K2γ2, where β and γ are the direction cosines of the magnetic moment with respect to the b-axis and the c-axis. The calculated values of K2 arising from the magnetic dipole interaction nearly accords with the experimental va…
Knowledge of the natural frequencies of air-core and iron-core coils and of transformer and generator windings is of essential theoretical and practical importance. In this paper an equivalent circuit method is derived for the computation of all the natural frequencies of interest of both air-core and iron-core coils.…
A brief survey is given of the methods of examining opaque specimens in the electron microscope. The principle of the scanning electron microscope is described and mention is made of previous instruments. The design of such microscopes is discussed and the theoretical limit on performance is determined. The optimum sc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Hydrolysis of Methoxysilanes. DimethylsilanediolSimon W. KantorCite this: J. Am. Chem. Soc. 1953, 75, 11, 2712–2714Publication Date (Print):June 1, 1953Publication History Published online1 May 2002Published inissue 1 June 1953https://pubs.acs.org/doi/10.1021/ja01107a048…
A constant stress testing machine of small inertia and with continuous strain recording has been built. The loading was by air contained in metallic bellows whose wall stiffness was compensated by a `negative spring'. The initial strain rate was standardized at 1% per second. Polycrystalline copper and aluminium have…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-temperature Heat Contents of Tantalum and Niobium OxidesRaymond L. OrrCite this: J. Am. Chem. Soc. 1953, 75, 12, 2808–2809Publication Date (Print):June 1, 1953Publication History Published online1 May 2002Published inissue 1 June 1953https://pubs.acs.org/doi/10.1021/ja0…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeats of Formation of Hafnium Oxide and Hafnium NitrideG. L. HumphreyCite this: J. Am. Chem. Soc. 1953, 75, 12, 2806–2807Publication Date (Print):June 1, 1953Publication History Published online1 May 2002Published inissue 1 June 1953https://pubs.acs.org/doi/10.1021/ja01108a0…
The techniques of structure analysis using single-crystal electron-diffraction patterns have been applied to the study of very small boric acid crystals in which there is almost complete disorder in the stacking of the two-dimensional layers of atoms.The structure of the layers and the nature of the order present are…
Abstract Theoretical and practical evidence is put forward to show that copolymers can be treated like solutions of small molecules in the interpretation of packing phenomena, and that ideal volume-additivity of the repeating units in copolymers is frequently realized. On this basis equations are derived for predictin…
The flexural vibrations of the walls of thin cylinders are considered. In this type of vibration many forms of nodal pattern may exist owing to the combination of circumferential and axial nodes. Theoretical expressions are developed for the natural frequencies of cylinders with freely-supported and fixed ends and a c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Adsorption of Flexible MacromoleculesRobert Simha, H. L. Frisch, and F. R. EirichCite this: J. Phys. Chem. 1953, 57, 6, 584–589Publication Date (Print):June 1, 1953Publication History Published online1 May 2002Published inissue 1 June 1953https://pubs.acs.org/doi/10.1021…
The field dependence of mobility has been determined for electrons and holes in both germanium and silicon. The observed critical field at 298\ifmmode^\circ\else\textdegree\fi{}K beyond which $\ensuremath{\mu}$ varies as ${E}^{\ensuremath{-}\frac{1}{2}}$ is 900 volts/cm for $n$-type germanium, 1400 volts/cm for $p$-ty…
Two or more dislocation lines meeting at a point constitute a node. In face-centred cubic lattices a dislocation can split into two partial dislocations. The requirements of crystal geometry impose certain limitations on the arrangement of partial dislocations at a node. The various possibilities are discussed. It is…
The geometrical properties of structures of the ReO3-type showing recurrent dislocations of atoms, analogous to those present in MosO~ 3, Mo90~ and W20Oss, are discussed. Two of the hypothetical atomic arrangements thus derived have been found to correspond to recently prepared molybdenum tungsten oxides (1V[o,W)10029…
1. Inmildlyalkaline suspension collagenis acetylated by acetic anhydride at the free amino groups. The number of N-acetyl groups introduced is equal to the total number of lysine and hydroxylysine residues found by analysis.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhenol-, Urea-, and Melamine-Formaldehyde PlasticsP. O. PowersCite this: Ind. Eng. Chem. 1953, 45, 5, 1063–1066Publication Date (Print):May 1, 1953Publication History Published online1 May 2002Published inissue 1 May 1953https://pubs.acs.org/doi/10.1021/ie50521a053https://do…